Add initial Blink-side support for the Screen Orientation API

Source/modules/screen_orientation/ScreenOrientation.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ScreenOrientation_h
+#define ScreenOrientation_h
+
+#include "core/events/EventTarget.h"
+#include "core/frame/DOMWindowProperty.h"
+#include "platform/Supplementable.h"
+#include "wtf/Vector.h"
+#include "wtf/text/AtomicString.h"
+#include "wtf/text/WTFString.h"
+
+namespace WebCore {
+
+class Frame;
+class Page;
+class Screen;
+
+enum ScreenOrientationValue {
+    OrientationInvalid = 0,
+    OrientationPortraitPrimary = 1,

[kenneth.r.christiansen, 2014/02/05 17:33:48]

These arguments might change. Beverloo suggested "current" and
"portrait-preferred" to replace the "-primary" one. Which will lock to the
current portrait orientation, if already in portrait

+    OrientationLandscapePrimary = 1 << 1,
+    OrientationPortraitSecondary = 1 << 2,
+    OrientationLandscapeSecondary = 1 << 3,
+    OrientationPortrait = OrientationPortraitPrimary | OrientationPortraitSecondary,
+    OrientationLandscape = OrientationLandscapePrimary | OrientationLandscapeSecondary,
+    OrientationAny = OrientationPortrait | OrientationLandscape
+};
+typedef unsigned char ScreenOrientationValues;
+
+class ScreenOrientation FINAL : public Supplement<Screen>, public DOMWindowProperty {
+public:
+    static ScreenOrientation* from(Screen*);
+    virtual ~ScreenOrientation();
+
+    DEFINE_STATIC_ATTRIBUTE_EVENT_LISTENER(orientationchange);
+
+    static const AtomicString& orientation(Screen*);
+    static bool lockOrientation(Screen*, const Vector<String>& orientations);

[kenneth.r.christiansen, 2014/02/05 17:33:48]

These will probably change to return a Promise. That was already agreed with the
maintainer of the spec

+    static bool lockOrientation(Screen*, const AtomicString& orientation);
+    static void unlockOrientation(Screen*);
+
+    void orientationChanged();
+
+private:
+    explicit ScreenOrientation(Screen*);
+    static const char* supplementName();
+
+    Page* page() const;
+
+    struct ScreenOrientationInfo {
+        const AtomicString& name;
+        ScreenOrientationValues orientation;
+    };
+    static ScreenOrientationInfo* orientationMap(unsigned& length);
+    static const AtomicString& orientationToString(ScreenOrientationValue);
+    static ScreenOrientationValues stringToOrientationValues(const AtomicString&);
+    bool lockOrientation(ScreenOrientationValues orientations);
+
+    Screen* m_screen;
+    ScreenOrientationValues m_allowedOrientation;
+};
+
+} // namespace WebCore
+
+#endif // ScreenOrientation_h